Regulating means for electric motors.



0. DE KAND6.

BEGULATING MEANS FOR ELECTRIC MOTORS. I APPLIOATIOH FILED SEPT. 26, 1907. RENEWED JULY 26, 1909.

wgfima Patented Apr. 18,3931.

2 sums-sum 1.

WITNESSES:

INVENTOR 0. DE KANDO. BEGULATING MEANS FOR ELECTRIC MOTORS.

APPLICATION FILED SEPT. 26, 1907. RENEWED JULY 26, 1909.

2 SHEETS-SHEET 2.

WITN ESSES INVENTOR Patented Apr. 18, 1911.

PATENT GULGM'AN DE KANEJ, 0F BUDAPEST, AUSTRIA-HUNGARY, 'llfi. WESTINGHOUSE, 9F PITTSBURG, PENNSYLVANIA.

REGULAI'ENG MEANS 1 0R ELECTRIC MUTGRS.

Specification of Letters Patent.

Patented Apr. 1S, 1911.

Application filed September 26, 1907, Serial No. 39%,757. Renewed July 26, 1909. SeriaiNo. 599,?02.

To all whom it may concern:

Be it known that l, CoLoMAN on Kai-o6, a subject of the Emperor of Austria-Hungary, and a resident of Budapest, Austria- Hungary, have invented a new and useful Improvement in Regulating Means for Electric Motors of which the following is a specification.

My invention relates to the regulation of electric motors, and particularly to the regulation of polyphasc induction motors.

The object of my invention is to provide means for causing a plurality of motors that are employed to propel a railway vehicle or train, or for other similar purposes, to operate under substantially the same conditions of load, irrespective of the speed.

Under certain conditions of operation, as, for instance, when the several driving wheels of a vehicle or train are of different diameters. the propelling motors will tend to run at different speeds, so that, during acceleration, one or more of the motors may attain t'ull speedbefore the remaining motors, and the loads upon the motors will, therefore, not be equal. in order to cause a plurality o1 motors that are operating under similar conditions to take substantially equal loads,

or to produce any other desired distribution of the load upon the motors, I propose to regulate the current supplied to all butone of the motors in response to variations in the amount of current supplied to the remaining motor.

Figure 1 of the accompanying drawings is a diagrammatic view of a system of distribution that embodies my invention, and Fig. 2 is a similar view of a modification of the system of Fig. 1.

The system of Fig. 1 comprises three polyphase induction motors 1, 2 and 3, having primary windings 4, 5 and 6, respectively, supplied from a suitable distributing circuit, such as trolley conductors 7, 8 and 9 of a railway system, and having secondary windings 10, 11 and 12, in circuit with which areincluded variable resistance devices 13, 1 1 and 15, respectively, here shown as of the water-rheostat type, though other suitable resistance may beemployed instead.

Each of the rheostats 13, 14 and 15 comprises two compartments 16 and 17, the one above the other, that are connected by means of a vertical pipe 18, and the height of the water in the upper compartment 16 is regulated by varying the pressure upon the suriace'of the liquid in the lower-compartment 17. the lower compartments of the rheostats being connected, by means of pipes 19, with. a suitable reservoir or source 20 of compressed air or other fluid.

The supply of compressed fluid to the lower compartment of the rheostat 18 is governed by means of a manuallyoperated valve 21. and the supply of fluid-pressure to the respective lower compartments oi the rheostats 14' and 15 is governed by means of valves 22 and 23. The valves 22 and 23 are, in turn, governed in operation by electromagnetic devices comprisinp; magnet windings 2d and 25 connected in series circuit with each other and with one of the connections between the primary winding of the motor 1 and the supply circuit i"-8-9. The said devices also comprise magnet windings 26 and 27 that are included, respectively, in series circuit with one of the con ncctions to each of the primary windings i and 6 of motors 2 and 3, the magnetizing eii'ects of the windings 26 and 27 opposing thoseot' the windings 24: and 25, respectively, and tending to close the valves 22 and 23, whereasthe windings 2a and act to open said valves.

In order to cause acceleration of the motors, the valve 21 is opened to admit fluidpressure to the lower compartment of the rheostat 13, which thereby causes a decrease in amount of resistance included in the secondary circuit of the motor 1. The current supplied to the primary winding of the motor 1, through the magnet windings and 25, therefore increases in amount and causes the latter to operate the valves 22 and QZi to admit fluid-pressure to the lower compartments of the rheostats t and The resistances in the secondary circuits of the motors 2 and3 are thereupon decreased and the currents supplied to the primary windings of the said motors increase correspondingly. The currents traversing the windings 26 and 27 also increase and, when the said currents equal that traversing the windings 2 1 and 25, the valves 22 and 23 will be moved to 'cut off or limit the supply of tiuidpressure to the lower compartments of the rheostats 14 and 15. Thus, the currents su plied to the motors 2 and 3 are maintained substantially equal to that supplied to the motor 1, irrespective of the ditierences of the speeds of operation of the said motors. '61 course, by suitably proportioning .the relative numbers of ampere turns in the windings 24 to 27, inclusive, the motors may be caused to operate under other desired conditions of load and, if different in capacity, may be causedto take loads in the ratio of their capacities;

the system shown in 2, primary windings I turn, governed by electro-magnetic devices comprising magnet windings lO-and 41 that are included, respectively, in'circuit with T the connections of the primary windings 30 and 31 to the conductor 9. The said electromagnetic devices also comprise magnet windings l2 and 4-3 connected in series relation and supplied with variable amounts of current from a subdivided transformer winding 4% that derives its energy from a distributing circuit 7-39. The amount of cur- "rent supplied to the windings 42 and 431's governed by means of a manually-operated switch arm 45 adapted to engage contact terminals 46 that are connected to the several points of subdivision of the transformer winding id. Also included in the connections of the primary windings 30 and 31 to the conductor 9 are the primary windings i7 and 48 of two series transformers, the secondary windings l9 and 50 or which are included in series circuit with the magnet windings 42 and i3, but are shunted by means of switches 51 and 52 during acceleration of the motors. 52 are actuated by means of floats 53 within the water-rheostats 36 and 37 to short-circuit the secondary windings oi the motors when all of the resistances have been removed from the. circuits thereof, whereupon the shunt circuits to the transformer windings 4:9 and 50 are interrupted.

in accelerating the motors, the switch arm 45 is moved from right to left over the contact terminals th as the currents in the secondary circuits of the motors decrease. It the motors are employed upon a railway vehicle and there is a difference in the diameters of the driving wheels to which they are connected, one of the motors may attain full speed before the other. in which event the secondary winding would become shortcircuited before that of the motor last to at tain i ull speed. This will be understood it it and The supply of fluid.

The switches 51 and I scenes is assumed that themotor 32 attains full speed before the motor 33, so that the current traversing the winding 40 becomes less than that traversing the winding 41:1, and

the valve-38 will be opened to such an extent that the level of the liquid in the upper compartment or the rheostat 36 rise more rapidly than that in the rheostat 3'1", and the switch 51 is thereby moved to its uppermost position in advance of a corresponding movement of the switch 52. TV hen the switch 51 is raised, the shunt to the secondary transformer winding 49 is removed and the said winding is thereupon included in series circuit with the magnet winding a3, and the current traversing the magnet winding 6L3 is thereafter determined by the amount OJRcurrent supplied to the primary winding of the motor 32, the switch arm 45 being then preferably in engagement with the contact terminal 46 farthest to the left. Thus, when the motor 32 attains full speed, the amount of current supplied to the pri mar windin. of the motor 33 will be overned in response to variations in the amount of current traversing the primary winding of the motor 32. The same effect upon the operation of the motor 32 would be caused it the motor 33 attained full speed before the motor 32.

It will be understood that the devices here shown are only illustrative of suitable means that may be employed for the purpose, and that others differing in structure and mode of operation may be employed without alter ing the mode of operation or the system as a whole or departing materially from the spirit of the invention, and I desire that all such modifications shall be included within its scope.

I claim as my invention:

1. The combination with a plurality of electric motors, of electro-magnetically con trolled devices which respond to variations in the amount of current supplied to one motor for governing the amounts of current supplied to the remaining motors.

2. The combination with a plurality of electric motors, of electro-magnetically controlled devices which respond to variations in the amount of current supplied to one motor for maintaining the current supplied to the respective motors substantially equal in amount.

3. The combination with a plurality of electric motors, and regulating resistances therefor, of electro-magnetically controlled devices which respond to variations in the amount of current supplied to one motor for governing the amounts of resistance included in the circuits of the remaining motors.

i. The combination with a plurality electric motors, and means for regula the speeds of operation thhreof, of means 'seasonwhereby the current supplied to one of the motors, after attaining full speed, efiects regulation of the amounts of current supplied to the remaining motors.

5. The combination with a plurality of electric motors, of means responsive to variations in the amount. of current supplied to one motor, after it attains a predetermined speedpfor governing the amounts of current supplied to the remaining motors. 6. The combination with a plurality of induction motors having primary and secondary windings, resistances in circuit with the secondary windings ofthfe' motors, of means responsive to variations in the amount of current supplied to the primary winding of one of the motors for governing the amounts of resistance, in the secondary circults of the remaining motors.

7. I The combination with a plurality of induction motors having primary and secondary windings, and resistances in circuit with the secondary windings thereof, of means responsive to variations in the amount of current supplied to the primary Winding of one of said motors, after it attains a predetermined speed, for governing the amounts of resistance in the secondary circuits of the remaining motors.

8. The combination with a plurality of induction motors and means for controlling said motors simultaneously and for automatically adjusting the relative torques of said motors.

9. The combination with a plurality of induction motors, and resistances for the secondary circuits thereof, of means for controlling said resistances simultaneously, and means for automatically adjusting the rela tive efiective values thereof, said latter means including a portion. of the'former.

10. The combination with a plurality of induction motors and means for controlling said motors simultaneously'and for automatically ,adjusting the relative torques of said motors in accordance with the difference in the amounts of current supplied to the motors. V 11. The combination with a plurality of induction motors, and resistances for the secondary circuits thereof, of means for con;

trolling said resistances simultaneously, and means for automatically adjusting the relative effective values thereof in accordance with the difference in the amounts of current supplied to the motors, sai'd latter means including a portion of the former.

12. The combination with a plurality of induction motors, of means responsive to variations in the amount of current Supplied to one motor for automatically governing the amounts of current supplied to the remaining motors.

13. The combination with a plurality of induction motors, of means responsive to variations in the amount of current supplied to one motor for automatically maintaining the current supplied to the respective motors substantially equal in amount.

14. The combination with a plurality of induction motors, of means responsive to variations in the amount of current supplied to one motor for automatically governing the amounts of resistances included in the secondary circuits of the remaining motors. In testimony whereof, I have hereunto subscribed my name this 22nd day of August, 1907.

COLOMAN DE KANDO. Witnesses:

PATRIN MANTERO, GIAeoMo PIGNOLO.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of latents,

Washington, D. G. 

